U0168
Lost Communication With Vehicle Security Control Module
Severity
HIGH
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)
Symptoms
- The immobilizer system does not work
- The alarm does not turn on
- Check Engine Light Is On
- There may be problems starting the engine
- Loss of communication with other modules
Causes
- Broken or damaged wires in the communication circuit
- Corrosion of contacts in connectors
- Security module malfunction
- Module power problems
- Software errors
How to Fix
- Check the integrity of wiring and contacts
- Scan all modules for errors
- Check power supply and grounding of the safety module
- Reflash or replace the security module if necessary
- Repair only from an authorized dealer